[Samba] make homedir

[Dan Am]

Hi,
I have a Winbind setup, where local and remote 
domainusers access a fileserver.
The problem: 
I inserted into [homes]:

root preexec = /root/bin/mkhome, 
which checks for $HOME and 
creates it when neccesary. 

I try and login from Lin and the remark is:

"it is not possible to change into the Dir /home/ad/user."

Why ? When the share is accessed it should be created ? 

Any ideas ? 

Regards 
Dan